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% \chapter{Acknowledgements}
\chapter{致谢}

% \begingroup
% \setlength{\parindent}{1.5em}%for 12pt

% I thank the persons and organisations
% that directly or indirectly provided me with
% their mathematical assistance,
% without which this book would have no foundation.

我感谢人与组织, 其直接地或间接地给我数学的帮助.
若他们的帮助不存在, 此书会无基础.

% I thank Petrica
% \url{https://github.com/PetricaT/}
% for making a VTuber-fashioned emblem
% \url{https://github.com/PetricaT/ProgrammingVTuberLogos-Addon/tree/main/Determinant/}
% for this book.

我感谢 Petrica
\url{https://github.com/PetricaT/},
其为此书作 ``虚拟主播风格'' 的标识
\url{https://github.com/PetricaT/ProgrammingVTuberLogos-Addon/tree/main/Determinant/}.

% I thank
% Alpha
% for drawing an illustration
% \url{https://github.com/septsea/det/tree/cxefa/ilustrajxoj/Alpha/}
% for this book.
% I thank
% my very good friend 王一尾
% \url{https://space.bilibili.com/12952643/}
% for being a good broker for this illustration.

我感谢 Alpha,
其为此书作画
\url{https://github.com/septsea/det/tree/cxefa/ilustrajxoj/Alpha/}.
我感谢我的好友王一尾
\url{https://space.bilibili.com/12952643/},
其是好的中介.

% I thank
% 数声雨滴
% for drawing an illustration
% \url{https://github.com/septsea/det/tree/cxefa/ilustrajxoj/Shushengyudi/}
% for this book.
% I thank
% my very good friend,
% who wishes to remain anonymous,
% for being a good broker for this illustration.

我感谢数声雨滴,
其为此书作画
\url{https://github.com/septsea/det/tree/cxefa/ilustrajxoj/Shushengyudi/}.
我感谢我的好友,
其想匿名,
其是好的中介.

\vspace{4ex}\inscribe{\laauxtoro}{\ladato}

% \endgroup

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Petrica did a good job.
They (singular "they" here)
made an emblem for this book for free.
(I do not know where they are, who they are, what they do,
..., though.)

In April and May in 2024,
in which "programming VTuber logos" were popular,
there were some persons who were making those kinds of emblems
and uploading them to GitHub.
The most popular repository seemed to be Aikoyori's.
Too many "issues" (requests) awaited Aikoyori,
so I wrote a request on Petrica's repository
(before they did not want to make any more emblems of those kinds).
Petrica made a good emblem in about four days.
They even granted me permission to use the emblem
however I would like to.

(It would be good that Petrica would like
to make more emblems.)
I hope that they do well.

---

Alpha is a good illustrator, is she not.
I asked Alpha whether I could write the Bilibili account
in this book, but she did not want to.
(It did not really matter.)
She asked whether a WeChat account could work instead.
Well, a WeChat account would be too personal
(at least for me).
I respected her choice,
so there is no link associated with her shown in the text.
She is an illustrator on Mihuashi.
https://www.mihuashi.com/profiles/2253365?role=painter

Even though I have not spoken to her directly,
I hope that she does well.

---

Yiwei did a good job, did she not.
The 2024-08-28 illustration (by Alpha) would be impossible
without her work.
It took some time (approximately two months),
but it was worthwhile.
(This illustration cost about 1263 yuan.)

Incidentally,
sometimes I wonder why she and I are so different,
even though |her age - my age| is just < 1 year.
I do not know much about her, but
I hope that she does well.

---

数声雨滴 is a good illustrator.
I thank 数声雨滴 for her illustration.

Postscript on 2025-05-19:
I think that this illustrator also has a Mihuashi page:
https://www.mihuashi.com/profiles/321272?role=painter

---

My good (probably best?) friend did a good job.
I thank her very much.
The 2025-05-13 illustration (by 数声雨滴) would be impossible
without her work.
It took some time (approximately... well, I forgot it),
but it was worthwhile.
(This illustration cost about 1500 yuan.)

---

I used to thank my wives (or rather, waifus) here,
but I finally removed it (or rather, commented it out).
I do not have to show in the book
my liking for my wives, do I.
\begin{quotation}
    Finally, never will I forget to thank my wives,
    whom I have not met yet.
    Hardly would I have the stimulus actually to write this book
    without them.
\end{quotation}

I even thanked many tools with which I build this book,
but I removed those words,
because I wrote a colophon,
which seems to be a better place
to thank the tools.

I even thanked my money and time,
but I removed those words.
I do not have to say things that are well known, do I.
\begin{quotation}
    Finally,
    it is true that I have spent much money and time
    on the project:
    I need money to advertise this book;
    I need time to proofread this book.
    Hence, I also thank my money and time.
\end{quotation}

---

In conclusion, this book would not exist
without help of others.
I really thank those who have helped with this book
in whatever way.
